Initial UART(E) implementation

CHANGELOG.md

@@ -21,6 +21,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Add Board struct following the pattern used in other nrf board support crates.
 - Add magnetometer example.
 - LEDs on the micro:bit V1 are now turned off per default
+- UART(E) is now exposed in the same way as I2C
 
 ## [0.10.1] - 2021-05-25
 

examples/serial-hal-blocking-echo/Cargo.toml

@@ -8,6 +8,16 @@ cortex-m-rt = "0.6.12"
 panic-halt = "0.2.0"
 defmt-rtt = "0.2.0"
 nb = "0.1.2"
+embedded-hal = "0.2.6"
 
 [dependencies.microbit]
 path = "../../microbit"
+optional = true
+
+[dependencies.microbit-v2]
+path = "../../microbit-v2"
+optional = true
+
+[features]
+v1 = ["microbit"]
+v2 = ["microbit-v2"]

examples/serial-hal-blocking-echo/src/main.rs

@@ -4,33 +4,56 @@
 use panic_halt as _;
 
 use core::fmt::Write;
-use microbit::hal;
-use microbit::hal::prelude::*;
-use microbit::hal::uart::Baudrate;
+
+#[cfg(feature = "v1")]
+use microbit::{
+    hal::prelude::*,
+    hal::uart,
+    hal::uart::{Baudrate, Parity},
+};
+
+#[cfg(feature = "v2")]
+use microbit::{
+    hal::prelude::*,
+    hal::uarte,
+    hal::uarte::{Baudrate, Parity},
+};
 
 use cortex_m_rt::entry;
 
+#[cfg(feature = "v2")]
+mod serial_setup;
+#[cfg(feature = "v2")]
+use serial_setup::UartePort;
+
 #[entry]
 fn main() -> ! {
-    if let Some(p) = microbit::Peripherals::take() {
-        let gpio = hal::gpio::p0::Parts::new(p.GPIO);
-
-        /* Initialise serial port on the micro:bit */
-        let mut serial = microbit::serial_port!(gpio, p.UART0, Baudrate::BAUD115200);
-
-        /* Print a nice hello message */
-        write!(serial, "Please type characters to echo:\r\n");
-
-        /* Endless loop */
-        loop {
-            /* Read and echo back */
-            if let Ok(c) = nb::block!(serial.read()) {
-                let _ = nb::block!(serial.write(c));
-            }
-        }
-    }
+    let board = microbit::Board::take().unwrap();
+
+    #[cfg(feature = "v1")]
+    let mut serial = {
+        uart::Uart::new(
+            board.UART0,
+            board.uart.into(),
+            Parity::EXCLUDED,
+            Baudrate::BAUD115200,
+        )
+    };
+
+    #[cfg(feature = "v2")]
+    let mut serial = {
+        let serial = uarte::Uarte::new(
+            board.UARTE0,
+            board.uart.into(),
+            Parity::EXCLUDED,
+            Baudrate::BAUD115200,
+        );
+        UartePort::new(serial)
+    };
 
     loop {
-        continue;
+        write!(serial, "Hello World:\r\n").unwrap();
+        let input = nb::block!(serial.read()).unwrap();
+        write!(serial, "You said: {}\r\n", input as char).unwrap();
     }
 }

examples/serial-hal-blocking-echo/src/serial_setup.rs

@@ -0,0 +1,46 @@
+use core::fmt;
+use embedded_hal::blocking::serial as bserial;
+use embedded_hal::serial;
+use microbit::hal::uarte::{Error, Instance, Uarte, UarteRx, UarteTx};
+
+static mut TX_BUF: [u8; 1] = [0; 1];
+static mut RX_BUF: [u8; 1] = [0; 1];
+
+pub struct UartePort<T: Instance>(UarteTx<T>, UarteRx<T>);
+
+impl<T: Instance> UartePort<T> {
+    pub fn new(serial: Uarte<T>) -> UartePort<T> {
+        let (tx, rx) = serial
+            .split(unsafe { &mut TX_BUF }, unsafe { &mut RX_BUF })
+            .unwrap();
+        UartePort(tx, rx)
+    }
+}
+
+impl<T: Instance> fmt::Write for UartePort<T> {
+    fn write_str(&mut self, s: &str) -> fmt::Result {
+        self.0.write_str(s)
+    }
+}
+
+impl<T: Instance> serial::Write<u8> for UartePort<T> {
+    type Error = Error;
+
+    fn write(&mut self, b: u8) -> nb::Result<(), Self::Error> {
+        self.0.write(b)
+    }
+
+    fn flush(&mut self) -> nb::Result<(), Self::Error> {
+        self.0.flush()
+    }
+}
+
+impl<T: Instance> bserial::write::Default<u8> for UartePort<T> {}
+
+impl<T: Instance> serial::Read<u8> for UartePort<T> {
+    type Error = Error;
+
+    fn read(&mut self) -> nb::Result<u8, Self::Error> {
+        self.1.read()
+    }
+}

examples/v2-speaker/src/main.rs

@@ -48,7 +48,7 @@ fn main() -> ! {
             let speaker = pwm::Pwm::new(board.PWM0);
             speaker
                 // output the waveform on the speaker pin
-                .set_output_pin(pwm::Channel::C0, &speaker_pin.degrade())
+                .set_output_pin(pwm::Channel::C0, speaker_pin.degrade())
                 // Use prescale by 16 to achive darker sounds
                 .set_prescaler(pwm::Prescaler::Div16)
                 // Initial frequency

microbit-common/Cargo.toml

@@ -34,7 +34,8 @@ version = "0.12.1"
 
 [dependencies.nrf52833-hal]
 optional = true
-version = "0.12.1"
+version = "0.13.0"
+git = "https://github.com/nrf-rs/nrf-hal"
 
 [features]
 doc = []

microbit-common/src/display/blocking.rs

@@ -72,12 +72,11 @@ impl Display {
     /// to create [`DisplayPins`].
     pub fn new(pins: DisplayPins) -> Self {
         let (cols, rows) = pins.degrade();
-        let mut retval = Display {
+        Display {
             delay_ms: DEFAULT_DELAY_MS,
             rows,
             cols,
-        };
-        retval
+        }
     }
 
     /// Clear the display

microbit-common/src/v1/board.rs

@@ -1,8 +1,8 @@
-use super::gpio::{DisplayPins, BTN_A, BTN_B, SCL, SDA};
+use super::gpio::{DisplayPins, BTN_A, BTN_B, SCL, SDA, UART_RX, UART_TX};
 use crate::{
     hal::{
         gpio::{p0, Disconnected, Level},
-        twi,
+        twi, uart,
     },
     pac,
 };
@@ -22,6 +22,9 @@ pub struct Board {
     /// I2C shared internal and external bus pins
     pub i2c: I2CPins,
 
+    /// UART to debugger pins
+    pub uart: UartPins,
+
     /// Core peripheral: Cache and branch predictor maintenance operations
     pub CBP: pac::CBP,
 
@@ -84,6 +87,9 @@ pub struct Board {
 
     /// nRF51 peripheral: TWI0
     pub TWI0: pac::TWI0,
+
+    /// nrf51 peripheral: UART0
+    pub UART0: pac::UART0,
 }
 
 impl Board {
@@ -112,8 +118,6 @@ impl Board {
                 p0_21: p0parts.p0_21,
                 p0_22: p0parts.p0_22,
                 p0_23: p0parts.p0_23,
-                p0_24: p0parts.p0_24,
-                p0_25: p0parts.p0_25,
                 p0_27: p0parts.p0_27,
                 p0_28: p0parts.p0_28,
                 p0_29: p0parts.p0_29,
@@ -140,6 +144,10 @@ impl Board {
                 scl: p0parts.p0_00.into_floating_input(),
                 sda: p0parts.p0_30.into_floating_input(),
             },
+            uart: UartPins {
+                tx: p0parts.p0_24.into_push_pull_output(Level::Low),
+                rx: p0parts.p0_25.into_floating_input(),
+            },
 
             // Core peripherals
             CBP: cp.CBP,
@@ -165,6 +173,7 @@ impl Board {
             TIMER1: p.TIMER1,
             TIMER2: p.TIMER2,
             TWI0: p.TWI0,
+            UART0: p.UART0,
         }
     }
 }
@@ -196,8 +205,8 @@ pub struct Pins {
     pub p0_21: p0::P0_21<Disconnected>,
     pub p0_22: p0::P0_22<Disconnected>,
     pub p0_23: p0::P0_23<Disconnected>,
-    pub p0_24: p0::P0_24<Disconnected>,
-    pub p0_25: p0::P0_25<Disconnected>,
+    // pub p0_24: p0::P0_24<Disconnected>, // UART TX
+    // pub p0_25: p0::P0_25<Disconnected>, // UART RX
     // pub p0_26: p0::P0_26<Disconnected>, // BTN_B
     pub p0_27: p0::P0_27<Disconnected>,
     pub p0_28: p0::P0_28<Disconnected>,
@@ -227,3 +236,20 @@ impl Into<twi::Pins> for I2CPins {
         }
     }
 }
+
+/// UART to debugger pins
+pub struct UartPins {
+    tx: UART_TX,
+    rx: UART_RX,
+}
+
+impl Into<uart::Pins> for UartPins {
+    fn into(self) -> uart::Pins {
+        uart::Pins {
+            txd: self.tx.degrade(),
+            rxd: self.rx.degrade(),
+            cts: None,
+            rts: None,
+        }
+    }
+}

microbit-common/src/v2/board.rs

@@ -1,8 +1,8 @@
-use super::gpio::{DisplayPins, BTN_A, BTN_B, INT_SCL, INT_SDA, SCL, SDA};
+use super::gpio::{DisplayPins, BTN_A, BTN_B, INT_SCL, INT_SDA, SCL, SDA, UART_RX, UART_TX};
 use crate::{
     hal::{
         gpio::{p0, p1, Disconnected, Level},
-        twim, twis,
+        twim, twis, uarte,
     },
     pac,
 };
@@ -28,6 +28,9 @@ pub struct Board {
     /// I2C external bus pins
     pub i2c_external: I2CExternalPins,
 
+    /// UART to debugger pins
+    pub uart: UartPins,
+
     /// Core peripheral: Cache and branch predictor maintenance operations
     pub CBP: pac::CBP,
 
@@ -114,6 +117,12 @@ pub struct Board {
 
     /// nRF52 peripheral: TWIS0
     pub TWIS0: pac::TWIS0,
+
+    /// nRF52 peripheral: UARTE0
+    pub UARTE0: pac::UARTE0,
+
+    /// nRF52 peripheral: UARTE1
+    pub UARTE1: pac::UARTE1,
 }
 
 impl Board {
@@ -138,7 +147,6 @@ impl Board {
                 p0_03: p0parts.p0_03,
                 p0_04: p0parts.p0_04,
                 p0_05: p0parts.p0_05,
-                p0_06: p0parts.p0_06,
                 p0_07: p0parts.p0_07,
                 p0_09: p0parts.p0_09,
                 p0_10: p0parts.p0_10,
@@ -156,7 +164,6 @@ impl Board {
                 p1_04: p1parts.p1_04,
                 p1_06: p1parts.p1_06,
                 p1_07: p1parts.p1_07,
-                p1_08: p1parts.p1_08,
                 p1_09: p1parts.p1_09,
             },
             display_pins: DisplayPins {
@@ -184,6 +191,10 @@ impl Board {
                 scl: p0parts.p0_26.into_floating_input(),
                 sda: p1parts.p1_00.into_floating_input(),
             },
+            uart: UartPins {
+                tx: p0parts.p0_06.into_push_pull_output(Level::High),
+                rx: p1parts.p1_08.into_floating_input(),
+            },
 
             // Core peripherals
             CBP: cp.CBP,
@@ -217,6 +228,8 @@ impl Board {
             TIMER4: p.TIMER4,
             TWIM0: p.TWIM0,
             TWIS0: p.TWIS0,
+            UARTE0: p.UARTE0,
+            UARTE1: p.UARTE1,
         }
     }
 }
@@ -230,7 +243,7 @@ pub struct Pins {
     pub p0_03: p0::P0_03<Disconnected>,
     pub p0_04: p0::P0_04<Disconnected>,
     pub p0_05: p0::P0_05<Disconnected>,
-    pub p0_06: p0::P0_06<Disconnected>,
+    // pub p0_06: p0::P0_06<Disconnected>, // UART RX
     pub p0_07: p0::P0_07<Disconnected>,
     // pub p0_08: p0::P0_08<Disconnected>, // INT_SCL
     pub p0_09: p0::P0_09<Disconnected>,
@@ -264,7 +277,7 @@ pub struct Pins {
     // pub p1_05: p1::P1_05<Disconnected>, // LEDs
     pub p1_06: p1::P1_06<Disconnected>,
     pub p1_07: p1::P1_07<Disconnected>,
-    pub p1_08: p1::P1_08<Disconnected>,
+    // pub p1_08: p1::P1_08<Disconnected>, // UART TX
     pub p1_09: p1::P1_09<Disconnected>,
 }
 
@@ -323,3 +336,20 @@ impl Into<twis::Pins> for I2CExternalPins {
         }
     }
 }
+
+/// UART to debugger pins
+pub struct UartPins {
+    tx: UART_TX,
+    rx: UART_RX,
+}
+
+impl Into<uarte::Pins> for UartPins {
+    fn into(self) -> uarte::Pins {
+        uarte::Pins {
+            txd: self.tx.degrade(),
+            rxd: self.rx.degrade(),
+            cts: None,
+            rts: None,
+        }
+    }
+}

microbit-common/src/v2/gpio.rs

@@ -114,8 +114,8 @@ pub type SCL = p0::P0_26<Input<Floating>>;
 pub type SDA = p1::P1_00<Input<Floating>>;
 
 /* uart */
-pub type UART_TX = p1::P1_08<Output<PushPull>>;
-pub type UART_RX = p0::P0_06<Input<Floating>>;
+pub type UART_TX = p0::P0_06<Output<PushPull>>;
+pub type UART_RX = p1::P1_08<Input<Floating>>;
 
 /* speaker */
 pub type SPEAKER = p0::P0_00<Output<PushPull>>;